fill is a verb (fill in the blanks)
full is a adjective (You are full of ideas)
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Defference between fill in & fill out
"Feel" and "fill" are not homophones.
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Get a container that has markings for how much liquid is in it. Fill it half way with water, and write down how full it is. Then stick your hand in the water and measure the new water level. The difference between the two water levels is the volume of you hand.
Presumably one is empty while the other one is full.